@awarns/ble/internal/provider.js

AwarNS Framework package that allows to scan for nearby BLE devices

import { ProviderInterrupter } from '@awarns/core/providers';
import { BleScan, BleScanType } from './scan';
import { getBleScanProvider as getNativeProvider, } from 'nativescript-context-apis/ble';
import { firstValueFrom, map, Subject, takeUntil, timer, toArray } from 'rxjs';
export class BleScanProvider {
    constructor(scanTime, scanMode, iBeaconUuids, nativeProvider = getNativeProvider) {
        this.scanTime = scanTime;
        this.scanMode = scanMode;
        this.iBeaconUuids = iBeaconUuids;
        this.nativeProvider = nativeProvider;
    }
    get provides() {
        return BleScanType;
    }
    async checkIfIsReady() {
        const isReady = await this.nativeProvider().isReady();
        if (!isReady) {
            throw bleScanProviderNotReadyErr;
        }
    }
    async prepare() {
        return this.nativeProvider().prepare();
    }
    next() {
        const interrupter = new ProviderInterrupter();
        const scanResult = this.obtainBleScan(interrupter);
        return [scanResult, () => interrupter.interrupt()];
    }
    obtainBleScan(interrupter) {
        const interrupted$ = new Subject();
        interrupter.interruption = () => {
            interrupted$.next();
            interrupted$.complete();
        };
        return firstValueFrom(this.nativeProvider()
            .bleScanStream({
            reportInterval: 100 /* Lower report intervals don't seem to report anything in background*/,
            scanMode: this.scanMode,
            iBeaconUuids: this.iBeaconUuids,
        })
            .pipe(takeUntil(timer(this.scanTime)), toArray(), map((results) => scanFromResults(results))));
    }
}
function scanFromResults(results) {
    if (results.length === 0) {
        throw new Error('No BLE devices were found nearby!');
    }
    return new BleScan(results.reduce((prev, curr) => [...prev, ...curr.seen], []), results[results.length - 1].timestamp);
}
const bleScanProviderNotReadyErr = new Error("BLE scan provider is not ready. Perhaps permissions haven't been granted, location services have been disabled or Bluetooth is turn off");
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